Efficiency (>15%) for thin-film epitaxial silicon solar cells on 70 cm2 area offspec silicon substrate using porous silicon segmented mirrors (pages 137–143)
I. Kuzma-Filipek, K.V. Nieuwenhuysen, J.V. Hoeymissen, M.R. Payo, E.V. Kerschaver, J. Poortmans, R. Mertens, G. Beaucarne, E. Schmich, S. Lindekugel and S. Reber
Version of Record online: 26 JAN 2010 | DOI: 10.1002/pip.953
The embedded segmented porous silicon broad-band reflectors are formed by gradual increase of the spatial period between the layer-segments, allowing for an enhanced absorption of low energy photons in the epitaxial layer. By combining these reflectors with well established solar cell processing by photolithography, a conversion efficiency of 15.2% was reached on 73 cm2 area, highly doped offspec multicrystalline silicon substrates. The corresponding photogenerated current densities (Jsc) were well above 31 mA/cm2 for an active layer of only 20 µm.